Handheld Multi-Material Bioprinter for In Situ Scaffold Fabrication
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Solution Overview
Problem
Conventional bioprinting technologies fail to achieve spatial control of multiple materials at injury sites, limiting the effectiveness of bioprinted scaffolds in recapitulating complex tissue structures and vascularization, and require secondary surgeries for implantation, which delays treatment and compromises scaffold integration with the body's environment.
Innovation Solution
A handheld multi-material bioprinter that allows for the simultaneous extrusion of multiple biomaterials with controlled flow rates and mixing, enabling the creation of scaffolds with embedded capillaries and customized architectures, which can be printed in situ, eliminating the need for secondary surgeries and improving tissue integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional bioprinting methods are used to deliver biomaterials, then material delivery is achieved, but spatial control and organization of the delivered material cannot be controlled
Solution Approach 1:
The bioprinting system is segmented into multiple independent material delivery channels, each capable of precisely controlling the deposition of different biomaterials. This segmentation allows spatial control over multiple materials while keeping each channel relatively simple in design.
Solution Approach 2:
A multi-material nozzle system acts as an intermediary component that integrates multiple material streams and enables precise spatial control of material deposition. The nozzle system mediates between the simple syringe-based material delivery and the complex requirement for spatial organization of multiple biomaterials.
2Adaptability or versatility
If single-material bioprinters are used for in situ printing, then printing within the body is achieved, but the effectiveness is limited due to inability to print multiple materials
Solution Approach 1:
Multiple single-material syringe systems are merged into a single handheld bioprinter device, allowing simultaneous or sequential delivery of multiple biomaterials. The merging is achieved through a common nozzle system and coordinated actuation, increasing versatility without proportionally increasing overall device complexity.
Solution Approach 2:
The bioprinter is designed with universal components that can handle different biomaterials through the same basic mechanism (syringe-based extrusion). The system can be configured to print different materials by simply changing the syringe contents, providing multi-functionality without requiring separate specialized devices for each material type.
3Loss of time
If traditional bioprinted constructs are printed outside the body and then implanted, then printing control is achieved, but secondary surgery is required for implantation which delays treatment
Solution Approach 1:
The bioprinter is designed to be handheld and sterilizable, allowing all printing准备工作 to be completed before surgery. The device can be prepared with materials loaded and programmed in advance, enabling immediate in situ printing during surgery without requiring separate implantation procedures, thus reducing treatment time and surgical complexity.
4Manufacturing precision
If extrusion-based printers are used for bioprinting, then material delivery is achieved, but the resolution is not high enough for detailed tissue engineering applications
Solution Approach 1:
The nozzle system uses a thin-film or small-orifice design that allows precise control of material extrusion at high resolution. The flexible delivery mechanism enables the nozzle to adapt to different printing requirements while maintaining fine feature resolution, achieving both high precision and reasonable printing speed for tissue engineering applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the creation of physiologically relevant tissue structures with enhanced vascularization and integration, reducing treatment delays and improving regeneration outcomes by allowing for real-time customization and spatial control of scaffold deposition directly at the injury site.
Implementation Method 1
The actuators can accurately push the plunger of the syringe towards the outlet (e.g., front) of the syringe, extruding the polymers out
Implementation Method 2
A mixer can mix the first and second biomaterials to form a mixture having a predetermined cross sectional structure
Implementation Method 3
The mixture can be extruded through a nozzle to form a filament
Data Source
AI summary
A multi-material printer can include a housing that is configured to be handheld. The housing can be configured to receive first and second printable materials from respective first and second containers. A nozzle can define an outlet of the multi-material printer. At least one actuator can be configured to cause first and second printable materials from the first and second containers to flow at a respective constant rate. The multi-material printer can be configured to simultaneously extrude the first and second printable materials from the outlet. The multi-material printer can be used for fabricating a scaffold from filaments comprising the first and second materials directly within the body of a human or animal.